The right hand of the above expression, which can been seen as a source term for the continuity equation, is related to the classical Schrödinger equation [1]}. The time-independent version of (6) is easily obtained through the relations \(\frac{\partial \rho }{\partial t}=0\) , \(\frac{\partial S}{\partial t}=-E \) . By introducing the convective derivative which is expressed as
\(\frac{d}{dt}=\frac{\partial }{\partial t}+\mathbf {v}\cdot \nabla =\frac{\partial }{\partial t}+\frac{\partial }{\partial t}\frac{\nabla S}{m}\cdot \nabla ,\) 
